Compositing is the combining of elements from separate sources into single images

        
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class CompositingDST extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;

    AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST, 0.5f);

    BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
    Graphics2D gbi = buffImg.createGraphics();

    gbi.setPaint(Color.red);
    gbi.fillRect(10, 10, 40, 40);
    gbi.setComposite(ac);

    gbi.setPaint(Color.green);
    gbi.fillRect(5, 5, 40, 40);

    g2d.drawImage(buffImg, 20, 20, null);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Composition");
    frame.add(new CompositingDST());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 120);
    frame.setVisible(true);
  }
}

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Compositing is the combining of elements from separate sources into single images : BufferedImage « 2D Graphics GUI « Java

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